Abstract
Members of the AP-1 family of transcription factors participate in the regulation of bone cell proliferation and differentiation. We report here a potent AP-1-related regulator of osteoblast function: ΔFosB, a naturally occurring truncated form of FosB that arises from alternative splicing of the fosB transcript and is expressed in osteoblasts. Overexpression of ΔFosB in transgenic mice leads to increased bone formation throughout the skeleton and a continuous post-developmental increase in bone mass, leading to osteosclerosis. In contrast, ΔFosB inhibits adipogenesis both in vivo and in vitro, and downregulates the expression of early markers of adipocyte differentiation. Because osteoblasts and adipocytes are thought to share a common precursor, it is concluded that ΔFosB transcriptionally regulates osteoblastogenesis, possibly at the expense of adipogenesis.
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References
Bellows, C. G., Wang, Y. -H., Heersche, J. N. M. & Aubin, J. E. 1,25-dihydroxyvitamin D3 stimulates adipocyte differentiation in cultures of fetal rat calvaria cells: comparison with the effects of dexamethasone . Endocrinology 134, 2221– 2229 (1994).
Grigoriadis, A. E., Schellander, K., Wang, Z-Q. & Wagner, E. F. Osteoblasts are target cells for transformation in c-fos transgenic mice. J. Cell Biol. 122, 685– 701 (1993).
Wang, Z-Q., Liang, J., Schellander, K., Wagner, E. F. & Grigoriadis, A. E. c-fos-induced osteosarcoma formation in transgenic mice: cooperativity with c-jun and the role of endogenous c-fos. Cancer Res. 55, 6244–6251 (1995).
Johnson, R. S., Spiegelman, B. M. & Papaioannou, V. Pleiotropic effects of a null mutation in the c- fosproto-oncogene. Cell 71, 577– 586 (1992).
Wang, Z. -Q., Ovitt, C., Grigoriadis, A. E., Mohle-Steinlein, U., Ruther, U. & Wagner, E. F. Bone and haematopoietic defects in mice lacking c- fos. Nature 360, 741– 745 (1992).
Gruda, M. C., van Amsterdam, J., Rizzo, C. A., Durham, S. K., Lira, S. & Bravo, R. Expression of FosB during mouse development: normal development of FosB knockout mice. Oncogene 12, 2177– 2185 (1996).
Chen, J., et al. Transgenic animals with inducible, targeted gene expression in brain. Mol. Pharmacol. 54, 495– 503 (1998).
Kelz, M. B., et al. Expression of the transcription factor ΔFosB in the brain controls sensitivity to cocaine. Nature 401, 272–276 (1999).
Soriano, P., Montgomery, C., Geske, R. & Bradley, A. Targeted disruption of the c-src proto-oncogene leads to osteopetrosis in mice. Cell 64, 693–702 (1991).
Hayman, A. R., et al. Mice lacking tartrate-resistant acid phosphatase (Acp 5) have disrupted endochondral ossification and mild osteopetrosis. Development 122, 3151–3162 ( 1996).
Seifert, M. F. & Marks, S. C. Morphological evidence of reduced bone resorption in the osteosclerotic (oc) mouse . Am. J. Anat. 172, 141– 153 (1985).
Franzoso, G. L., et al. Requirement for NF-κB in osteoclast and B-cell development . Genes Dev. 11, 3482–3496 (1997).
Tondravi, M. M., et al. Osteopetrosis in mice lacking haematopoietic transcription factor PU.1. Nature 386, 81– 84 (1997).
Marks, S. C.,Jr. & Lane, P. W. Osteopetrosis, a new recessive skeletal mutation on chromosome 12 of the mouse . J. Hered. 67, 11–18 (1976).
Simonet, W. S., et al. Osteoprotegerin: a novel secreted protein involved in the regulation of bone density . Cell 89, 309 –319 (1997).
Ducy, P., et al. Increased bone formation in osteocalcin-deficient mice. Nature 382, 448–452 ( 1996).
Arneet, R. & Dempster, D. The effect of pH on bone resorption by rat osteoclasts in vitro. Endocrinology 119, 119–124 (1986).
Anderson, R., Woodbury, D. & Jee, W. Humoral and ionic regulation of osteoclast acidity. Calcif. Tissue Int. 39, 252–258 (1986).
Ducy, P., et al. Leptin inhibits bone formation through a hypothalamic relay: a central control of bone mass. Cell. 100, 197–207 (2000).
Chen, J., Kelz, M. B., Hope, B. T., Nakabeppu, Y. & Nestler, E. J. Chronic Fos-related antigens: stable variants of ΔFosB induced in brain by chronic treatments. J. Neurosci. 17, 4933–4941 (1997).
Dorheim, M. et al. Osteoblastic gene expression during adipogenesis in hematopoietic supporting murine bone marrow stromal cells. J. Cell Physiol. 154, 317–328 (1993).
McCabe, L. R., et al. Developmental expression and activities of specific Fos and Jun proteins are functionally related to osteoblast maturation: Role of Fra-2 and Jun D during differentiation. Endocrinology 137 , 4398–4408 (1996).
Liberati, N., et al. Smads bind directly to the Jun family of AP-1 transcription factors. Proc. Natl. Acad. Sci. USA 96, 4844–4849 (1999).
Owen, T. A., et al. Coordinate occupancy of AP-1 sites in the vitamin D-responsive and CCAAT box elements by Fos-Jun in the osteocalcin gene: model for phenotype suppression of transcription. Proc. Natl. Acad. Sci. USA 87, 9990–9994 (1990).
Banerjee, C., et al. TGF-β1 response in the rat osteocalcin gene is mediated by an AP-1 binding site. Endocrinology 137, 1991–2000 (1996).
Distel, R. J., Ro, H. S., Rosen, B. S., Groves, D. L. & Spiegelman, B. M. Nucleoprotein complexes that regulate gene expression in adipocyte differentiation: direct participation of c-fos. Cell 49, 835–844 ( 1987).
Stephens, J. M., Butts, M. D. & Pekala, P. H. Regulation of transcription factor mRNA accumulation during 3T3-L1 preadipocyte differentiation by tumor necrosis factor-alpha . J. Mol. Endocrinol. 9, 61– 72 (1992).
Parfitt, A. M., et al. Bone histomorphometry: Standardization of nomenclature, symbols, and units. Report of the ASBMR histomorphometry nomenclature committee. J. Bone Miner. Res. 2, 595–610 (1987).
Bellows, C. G., Heersche, J. N. M. & Aubin, J. E. Determination of the capacity for proliferation and differentiation of osteoprogenitor cells in the presence and absence of dexamethasone . Dev. Biol. 140, 132–138 (1990).
Quarles, L. D., Yohay, D. A., Lever, L. W., Caton, R. & Wenstrup, R. J. Distinct proliferative and differentiated stages of murine MC3T3-E1 cells in culture: an in vitro model of osteoblast development. J. Bone Miner. Res. 7, 683– 692 (1992).
Cao, Z., Umek, R. M. & McKnight, S. L. Regulated expression of three C/EBP isoforms during adipose conversion of 3T3-L1 cells. Genes Dev. 5, 1538–1552 (1991).
Aoki, K., et al. They tyrosine phosphatase SHP-1 is a negative regulator of osteoclastogenesis and osteoclast resorbing activity: increased resorption and osteopenia in me v/me v mutant mice. Bone 25, 261–267 (1999).
Takahashi, N., et al. Osteoclast-like cell formation and its regulation by osteotropic hormones in mouse bone marrow cultures. Endocrinology 122, 1373–1382 (1988).
Sambrook, J. Fritsch, E. F. & Maniatis, T. Molecular Cloning: A Laboratory Manual 2nd ed. (Cold Spring Harbor Laboratory Press, New York, 1989).
Sabatakos, G., Davies, G. E., Grosse, M., Cryer, A. & Ramji, D. P. Expression of the genes encoding CCAAT-enhancer binding protein isoforms in the mouse mammary gland during lactation and involution. Biochem. J. 334, 205–210 (1998).
Schreiber, E., Matthias, P., Muller, M. M. & Schaffner, W. Rapid detection of octamer binding proteins with ‘mini-extracts’, prepared from a small number of cells. Nucleic Acids Res. 17, 6419 (1989).
Baron, R., Vignery, A., Neff, L., Silverglate, A. & Maria, A. S. in Bone histomorphometry: technique and interpretation Vol. 1 (ed Recker, R.R.) 13–35 (CRC Press, Boca Raton, Florida, 1983).
Acknowledgements
The authors thank Nancy Troiano, Jennifer Juel, Cathy Steffen and Emilia DiDomenico for expert technical assistance. We also thank A. Houghton and W. C. Horne for many helpful discussions and critical reading of the manuscript; G. Karsenty and P. Ducy for providing cDNA probes and the CBFA1 antisera; S. Roman-Roman for supplying rhBMP-2. This work was supported in part by Hoechst Marion Roussel.
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Sabatakos, G., Sims, N., Chen, J. et al. Overexpression of ΔFosB transcription factor(s) increases bone formation and inhibits adipogenesis. Nat Med 6, 985–990 (2000). https://doi.org/10.1038/79683
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DOI: https://doi.org/10.1038/79683